JP4190559B2 - Equipment for cooking food under pressure - Google Patents

Abstract

The cooker has a cover (2) connected and locked on a cooking vessel (1) for forming a sealed cooking enclosure, where the cover has a locking/unlocking unit (3) relative to the cooking vessel. A pressure regulating unit maintains a relative pressure reigning in the enclosure to a constant operating pressure such that the operating pressure is between 4.5 to 19.9 kilo-Pascal. The pressure regulating unit authorizes a drop in the pressure reigning in the enclosure when the pressure regulating unit is activated.

Description

TECHNICAL FIELD The present invention relates to the general technical field of household appliances for cooking under pressure, such as a pressure cooker, to form a bowl and a closed container for cooking that is locked and sealed to the bowl. And such an appliance is configured to cook the food contained in the bowl under steam pressure.

More particularly, the present invention relates to household appliances for cooking under pressure, a cooking bowl, a lid attached to and locked to the bowl to form a substantially sealed closed container for cooking. Part, lock / unlock means for locking and unlocking the lid with respect to the bowl, and maintaining the relative pressure inside the closed container at a predetermined value which is substantially constant and referred to as cooking pressure. A pressure conditioner configured to be a safety condition that is acceptable to the user for the pressure existing in the closed container that is maintained by the pressure conditioner means by being operated directly or indirectly by the user. to drop the pressure that can unlock the lid under (drop relative pressure), reduced pressure means configured to forcibly drop and, inside the enclosure Corresponding to the existing pressure and allowing the lid to be locked and unlocked with respect to the bowl, the lid is unlocked with respect to the bowl in cooperation with the locking / unlocking means. It has an open safety means that is mounted to move between the upper limit positions where it is prevented.

Prior art Among the types of pressure cookers, household appliances for cooking under pressure are well known.

  They provide a hermetically sealed enclosure in which food is placed, which can reach high pressures and temperatures when the instrument is affected by a heat source.

  The combined action of high pressure and high temperature levels reached in known pressure cookers allows food to be cooked very quickly while ensuring that the sensory and nutritional properties of the food are not compromised.

  Such known pressure cookers generally provide sufficient satisfaction, but are constraining the user as to how to cook.

  Cooking food using a type of appliance such as a pressure cooker needs to be carried out continuously. That is, the user cannot take any action directly on the food during the start and end of the cooking process.

  In other words, in cooking using a conventional pressure cooker, when cooking is being performed, the user may, for example, add cooking ingredients, taste food, or more generally In order to directly monitor the progress of cooking, the lid cannot be temporarily opened at least in a simple and quick manner.

  During cooking with a conventional pressure cooker, that is, when the pressure cooker is still affected by a heat source, it is impossible for the user to open the lid of the pressure cooker. Due to the high level of pressure (relative pressure approximately located in the range of 55-90 kPa) present inside the vessel. Opening the lid directly when exposed to such pressures, to a lesser extent, can severely injure the user and, if appropriate, a spray that is hot enough to burn. May lead to sudden release of parts.

  Therefore, before opening the lid of the conventional pressure cooker, by stopping the application of heat and communicating the inside and outside of the closed container through the valve device provided for this purpose, It is necessary to depressurize the closed container for cooking.

  Due to the high level of pressure inside the enclosure, the time used for decompression is generally very long (even if the instrument is placed under a stream of cold water), resulting in This is incompatible with the temporary opening of the lid during cooking. In addition, known cooking utensils are generally provided with a safety device to control the opening, and the safety device can be operated by the user as long as the pressure inside the utensil is above atmospheric pressure. Blocks opening. Therefore, to open the lid, the user must wait until the pressure inside the enclosure is approximately equal to atmospheric pressure. This waiting time is generally very long, a known appliance for cooking under pressure, stew pan, i.e. an appliance capable of opening the lid temporarily and quickly during cooking. As hinder use.

  Further, the known cooking utensil has a bowl and a lid, and the lid is provided with an adjustment valve and a device for locking the lid hermetically at a substantially atmospheric pressure or with respect to the bowl. In the case of this utensil, it is possible to cook food at a slightly higher pressure.

  Unlike conventional pressure cookers, such a low-pressure cooker actually opens the lid directly and freely in the middle of a cooking cycle without having to start performing a genuine advance decompression. Allow to do.

  These utensils actually allow the lid to be opened almost instantaneously during cooking, but the type that occurs in conventional pressure cookers is particularly concerned with maintaining cooking speed and food properties. Does not provide the advantage of working with authentic pressure cooking.

  These utensils function like conventional soup pans that are slightly modified.

SUMMARY OF THE INVENTION Accordingly, the object of the present invention is to provide an remedy for the various drawbacks mentioned above and to open the lid relatively easily and quickly at any time during cooking without stopping heating. Allows you to perform cooking in a way that approximates what you would get with a conventional pressure cooker of the prior art, while still allowing you to do it and still providing a very high level of safety And to propose a new household appliance for cooking under pressure.

  Another object of the present invention is to propose a new household appliance for cooking under pressure which provides a very good compromise with regard to cooking speed and decompression speed.

  Another object of the present invention is to provide a new household appliance for cooking under pressure which presents a very good compromise on cooking speed, flexibility of use and safety.

  Another object of the present invention is to propose a new household pressure cooker that is very easy to use.

The object of the present invention is to provide a lid for forming a closed container, a lock / unlock means for locking and unlocking the lid with respect to the bowl, and a relative pressure inside the closed container. Pressure regulating means configured to maintain a constant and predetermined value referred to as cooking pressure, said closure being maintained by said pressure regulating means by being operated directly or indirectly by a user Decompression means configured to forcibly lower the pressure present in the container to a lowering pressure (relative relative pressure) that can unlock the lid under safe conditions acceptable to the user ; and A lower limit position corresponding to the pressure existing in the closed container and allowing the lid to be locked and unlocked with respect to the bowl; and the lock / unlock Household for cooking under pressure, having open safety means attached to move between an upper limit position in cooperation with the means to prevent the lid from being unlocked relative to the bowl Achieved by the instrument.

According to the present invention, the pressure adjusting means is configured so that the cooking pressure is substantially in the range of 4.5 to 30 kPa, and the pressure reducing means has a pressure drop (relative relative pressure) of 1. The open safety means is configured so as to reach the lower limit position when the pressure inside the closed container reaches the drop pressure ( drop relative pressure ). Configured to descend.

BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the present invention will appear and be understood in detail with reference to the accompanying drawings, given purely as non-limiting embodiments, and by reading the description that follows. Is possible.

  FIG. 1 is a schematic perspective view of a household appliance for cooking under pressure according to the present invention.

  FIG. 2 is an exploded perspective view showing details of the embodiment of the lid in the cooking utensil according to the present invention.

  FIG. 3 is a partial cross-sectional view showing details of an embodiment of an open safety means for a cooking utensil according to the present invention, in the middle of a lid being sealingly locked to a bowl by a user. is there.

  4 is a plan view of the cooking utensil of the present invention corresponding to the details shown in FIG.

  FIG. 5 is a partial cross-sectional view showing details of the embodiment shown in FIG. 3 and is in the process of depressurization of the instrument by the user.

  6 is a plan view showing a cooking utensil according to the present invention corresponding to the details shown in FIG.

  FIG. 7 is a partial cross-sectional view of the details of the embodiment shown in FIG.

  FIG. 8 is a plan view of a cooking utensil according to the present invention corresponding to the details shown in FIG.

  FIG. 9 is a partial cross-sectional view showing details of the same embodiment shown in FIG. 7 and is in the process of unlocking the lid by the user.

  FIG. 10 is a plan view of the cooking utensil of the present invention corresponding to the details shown in FIG.

Optimal method for practicing the present invention The cooking utensil according to the present invention is used for cooking various types of food under pressure in a domestic background. Accordingly, the cooking utensil to which the invention is applied is intended for use in a home environment and is portable, unlike industrial utensils.

  As usual, the cooking utensil according to the invention has a bowl 1 forming a cooking vessel, which bowl 1 is preferably approximately rotationally symmetric with respect to the axis X-X '. In the following, the adjective “axial” is used to refer to the direction of the axis of symmetry X-X ′, which approximates perpendicular when the instrument is in normal operation.

  As usual, the bowl 1 is formed from a metal such as stainless steel, and is provided with a heat conducting bottom 1A that is fixed to the bowl 1 by, for example, a hot stamp.

  The bowl 1 also has members for grasping, such as handles 1B, 1C, and the like. The members preferably include two members, and are fixed to the bowl 1 at, for example, diagonal positions.

  The utensil also has a lid 2, which is attached to the bowl 1 and is substantially sealed, i.e. sufficiently sealed tightly so that an increase in pressure is allowed. Is formed.

  The lid 2 is advantageously substantially circular and has a typical diameter of, for example, about 26 centimeters (cm), corresponding to current standards for stew pans.

  The lid 2 is locked (see FIGS. 4, 6 and 8) or unlocked by the lock / unlock means 3 for engaging the lid 2 with the bowl 1 (see FIGS. 4, 6 and 8). (See FIG. 10).

  The locking / unlocking means 3 can be of any type known to those skilled in the art, in particular functionally on at least one member 3B, 3C for fixing the lid 2 to the bowl 1 It is possible to provide a knob type manual control member 3A to be coupled.

  In the following, referring to more details, the lock / unlock means 3 has jaws 3B, 3C controlled by a rotary knob 3A, as shown in FIG.

  The jaws 3B and 3C can take the form of a metal plate having a groove at the outer end so that the outer peripheral end of the bowl 1 and the outer peripheral end of the lid portion 2 can be clamped simultaneously.

  As can be seen, there are advantageously two jaws positioned diagonally with respect to the general symmetry axis X-X 'of the instrument.

  The jaws are advantageously moved radially between a locked position and an unlocked position under the control of a rotating intermediate plate 3D that is rotated directly under the control of the rotary knob 3A. Further, the intermediate plate 3D affects the jaws 3B and 3C by performing translation on the guide studs 4 and 5 associated with the jaws 3B and 3C (see FIG. 2).

  The knob 3A is fixed to the intermediate plate 3D via fixing pins 3E and 3F. The assembly formed by the plate 3D and the knob 3A is attached to the seat 3G attached to the lid 2 by rotating.

  However, the lock / unlock means 3 for locking and unlocking the lid portion 2 with respect to the bowl 1 is not limited to the jaw method, and for example, an insertion lock method, a segment lock method, etc. without exceeding the scope of the present invention. It can also be based on a locking bar scheme or other means well known to those skilled in the art.

  The household cooking utensil according to the present invention has a pressure adjusting means 6, and the pressure adjusting means 6 converts the relative pressure (that is, the pressure measured at the atmospheric pressure) present in the closed container into the cooking pressure Pc. Configured to maintain a substantially constant predetermined value referred to as.

  The general principle of operation of such adjustment means 6 is well known to those skilled in the art.

  Thus, as usual, the pressure adjusting means 6 is responsive to the pressure present inside the cooking enclosure, and has at least one first position where the abutment and rappel are stable, and at least one Mounted to move between leak locations. In the first position, as long as the pressure inside the closed container is approximately equal to or less than the predetermined cooking pressure Pc, communication between the closed container and the outside of the appliance is prevented. In the leakage position, as long as the pressure inside the closed container exceeds a predetermined cooking pressure Pc, the inside of the closed container communicates with the outside of the appliance.

  Accordingly, such pressure adjusting means 6 maintains the pressure inside the closed container around a predetermined nominal level Pc once the instrument has completed the transient pressure rise and once reaches a steady operating state. To function.

  The pressure adjusting means 6 is usually constituted by a valve loaded with a load or a valve deflected by a compression spring, and in a hole between the lower limit seal position and one or more upper limit leak positions. Attached movably.

  As is well known to those skilled in the art, the pressure adjusting means 6 can also be provided with a calibrating device, which can be connected by a user via a member for selecting pressure, for example, It is possible to select a predetermined value for the cooking pressure Pc from a plurality of cooking pressure levels as a function of the type of food present in the cooking utensil.

  According to the invention, the cooking utensil also includes a decompression means 6 which is suitable for being activated and deactivated, when the decompression means 6 is activated, the pressure inside the closed container drops. Configured to allow that.

  The function of the decompression means 6 capable of freely operating and deactivating the cooking utensil according to the present invention is particularly as follows.

  When the decompression means is deactivated, the decompression means can substantially prevent the leakage of steam from the inside of the closed container to the outside.

When the depressurization means is operating, the depressurization means causes the vapor to leak by communicating the inside and the outside of the closed container, thereby reducing the pressure inside the closed container. The pressure is from a first value corresponding to the cooking pressure Pc to a second value (drop pressure) corresponding to unlocking the lid under a safe condition that is lower than the first value and acceptable to the user. Change.

  The decompression means 6 is preferably operable so that it can be operated irrespective of the level of pressure present inside the closed container, in particular when the pressure inside the closed container is approximately equal to the cooking pressure Pc. Is composed.

  The decompression means can be constituted by ordinary means known to those skilled in the art. In particular, the shape and dimensions of the decompression means need to be set so that decompression can be performed without blowing off the danger of cooking ingredients (food, boiled soup) that are hot enough to burn.

  Advantageously, the function of the depressurizing means is performed by a pressure adjusting means 6 that performs two functions.

  For this purpose, the pressure regulating means 6 advantageously comprises actuable engaging means 6A, for example in the form of an actuator head. Since this actuable engaging means 6 functions to position the adjusting means at the leakage position when actuated, the adjusting means 6 also constitutes an actuatable pressure reducing means.

  The decompression means, in this case the engagement means 6A (see FIG. 2), is operated directly by the user, eg manually or indirectly, using the manual control member 3A, and the engagement means 6A. It is possible to cause a movement of the slope 9 which is configured to dominate the displacement.

  According to an important feature of the present invention, the pressure adjusting means is configured so that the cooking pressure Pc is substantially located in the range of 4.5 to 30 kPa, more preferably in the range of 10 to 30 kPa. Adapted to the instrument.

  In particular, the configuration and dimensions of the pressure adjusting means 6 are set so as to control the pressure and be in the range of 4.5 to 30 kPa, more preferably in the range of 10 to 30 kPa.

  Therefore, the pressure adjusting means 6 is configured to perform its function regardless of the variability of the commercially available heat source.

  The applicant has found that the selection of the cooking pressure Pc located in the range of 4.5-30 kPa, more preferably in the range of 10-30 kPa, depends on the time required for cooking on one side and the cooking pressure on the other side. Very good, between the duration of decompression of the instrument when it is desired to move from Pc to a lower limit pressure that is adapted to open the lid under acceptable safety conditions for the user It is to provide a compromise.

  It has been found that the cooking pressure Pc located in the above range allows a sufficiently short decompression time and burns during decompression even when the appliance is continuously exposed to a constant heater output. Suitable for temporarily opening the lid during cooking, for example to add seasonings or taste to food present in closed containers without leading to hot spraying It is that you are.

  Therefore, the above pressure range makes it possible to enjoy the advantages relating to the flexibility of using normal stew bread as well as the advantages of cooking under pressure. Although the range of 4.5-30 kPa is significantly lower than the normal range of 55-90 kPa, the cooking pressure Pc determined by the applicant in the framework of the invention is operated at a pressure near atmospheric pressure. Compared to a normal soup pot, it will be possible to save enough time.

  Accordingly, the pressure cooking utensil of the present invention, on the one hand, enables genuine pressure cooking, and on the other hand, to allow decompression at a safe and sufficient speed, This allows the user to open the lid at any time without having to be separated from the heat source and without having to adjust (eg, reduce) the output of the heat source.

  Preferably, the cooking pressure Pc of the appliance according to the present invention is located in the range of 5-30 kPa, in the range of 5-10 kPa, in the range of 10-15 kPa, in the range of 15-20 kPa, in the range of 20-25 kPa, and 25 The range of ˜30 kPa is also useful to give interesting individual results.

  Particularly advantageously, the cooking pressure Pc is approximately equal to 20 kPa.

  The applicant has confirmed that when the cooking pressure Pc is substantially equal to 20 kPa, the internal temperature of the closed container can be increased to about 105 ° C., compared with a normal stew pan. The cooking time savings obtained using the utensils in accordance with are: 25% when cooking roast pork, 33% when cooking carrots in water, and when cooking salmon in steam 22%.

  In addition, when the utensil according to the present invention has a cooking pressure Pc substantially equal to 20 kPa, the decompression time consisting of about 5 seconds (the pressure existing inside the closed container is reduced from the cooking value under the following conditions: It is possible to obtain a time corresponding to the time required to descend to a value adapted to the safe opening of the lid.

  The instrument contains 1 liter (L) of 1 liter (L) of water. The instrument is exposed to an inductive heat source having a power approximately equal to 450 watts (W). The appliance is continuously exposed to the effects of the heat source, even during the decompression operation.

  Advantageously, the household appliance for cooking under pressure according to the invention also includes an open safety means 7 for sensing the pressure and / or temperature present inside the enclosure.

  Advantageously, the opening safety means 7 interacts with the locking / unlocking means 3 so long as the pressure present inside the enclosure is above a predetermined value and / or inside the enclosure. As long as the temperature exceeds a predetermined value, the lid portion 2 is prevented from being unlocked with respect to the bowl 1.

  Preferably, the open safety means 7 has a pressure gauge rod 7A that senses the pressure present inside the enclosure. The rod 7A is movably attached between a lower limit position (see FIGS. 7 and 9) and an upper limit position (see FIGS. 2, 3, and 5) through a hole 8 formed in the lid 2. It is done. In the lower limit position, the rod 7 </ b> A allows the lid 2 to be locked or unlocked with respect to the bowl 1. In the upper limit position, the rod 7A cooperates with the lock / unlock means 3 to prevent the lid 2 from being unlocked from the bowl 1.

  Such open safety means are well known with regard to their general principles. It is reliable against opening by allowing the lid 2 to be separated from the bowl 1 only when the level of pressure inside the closed container reaches a level that is acceptable from a user safety standpoint. (Positive) Provides safety.

Advantageously, for example, the open safety means 7 with the pressure gauge rod 7A is used once the pressure present in the closed container reaches a rising pressure ( rising relative pressure ) value approximately located in the range of 1.5 to 4 kPa. When it reaches, it is configured to be held at the upper limit position under the influence of the pressure.

  Preferably, the opening safety means 7 is configured such that the rising pressure is approximately equal to 3 kPa ± 0.5 kPa.

  More advantageously, the rising pressure is approximately equal to 3.3 kPa.

Advantageously, the open safety means 7 has a pressure drop ( relative relative pressure ) value in which the pressure inside the enclosure is in the range from 1 to 4 kPa, more preferably in the range from 1.5 to 4 kPa. When reaching, it is configured to descend toward its lower limit position.

  The drop pressure is also generally lower than the rise pressure.

  Preferably, the drop pressure is approximately located in the range of 1.5 to 2 kPa, or in the range of 1.5 to 2 kPa excluding the lower limit (1.5 kPa). The pressure drop can also be approximately located in the range of 1.6-2 kPa, alternatively in the range of 2-3 kPa, alternatively in the range of 3-4 kPa, and thus does not exceed the scope of the present invention.

  A drop pressure approximately equal to 2.5 kPa ± 0.5 kPa also gives good results.

  In general, in the framework of the present invention, for example, the size and shape of the open safety means 7 formed by the pressure gauge rod 7A is such that the drop pressure is lower than the rise pressure but as close as possible to the rise pressure. Need to be set.

  The open safety means 7 must also be configured in such a way that the pressure drop is as high as possible within the limits of the current standard that currently defines the 4 kPa limit that must not be exceeded as pressure drop. is there. Choosing a drop pressure that is high, for example in the range of 1.5-2 kPa, compared to prior art pressure cookers where the drop pressure generally does not exceed 0.5 kPa 2 can be opened more quickly.

  However, obtaining a high pressure drop generally makes the pressure gauge rod 7A heavier.

  This increase in weight is of course detrimental to the rapid increase in pressure gauge rod 7A toward the upper limit position as the pressure inside the utensil increases and can slow down the cooking cycle.

  Therefore, in the framework of the present invention, the instrument is advantageously provided with actuator means 10 for driving the safety rod 7A. The actuator means 10 is then configured to allow the rod 7A to be placed in the upper limit position regardless of the pressure value present inside the closed container.

  In this way, the actuator means 10 mechanically drives the rod 7A toward the upper limit position. The upper limit position is preferably a position that is sealed due to the presence of the seal gasket 12 that supports the rod 7A.

  Advantageously, the opening safety means 7 is also operatively connected to signal means for notifying the user whether the lid 2 can be opened.

  Preferably, the signal means is of the visible type and is advantageously constituted by the body part of the pressure gauge rod 7A itself, depending on its position, in particular in the protective casing 7C containing the open safety means 7 It becomes visible or invisible to the user's eyes through the opening 7B.

  This configuration allows the user to immediately unlock the lid 2 because the user is momentarily notified when the pressure condition inside the closed container matches a safe unlock.

  In the following, the operation of the cooking utensil according to the present invention will be described.

  First, the user places food in the bowl 1, that is, directly in the bowl 1 or indirectly through a removable basket included in the bowl 1.

  Then, as shown in FIGS. 9 and 10, the user places the lid 2 on the bowl 1. At this point, the jaws 3B, 3C are in the unlocked position, and the decompression means is in operation (i.e., the actuator head 6A is maintained at the upper limit by the slope 9), while the open safety rod 7 is in the lower limit position.

  Thereafter, the user locks the lid 2 with respect to the bowl 1 by rotating the knob 3A clockwise with a first predetermined stroke to establish the sealing performance, and as a result, the radial and centripetal. The parallel movement of the jaws drives the jaws toward their locked position, while the ramp 10 constituting the actuator means advances the safety pressure gauge rod 7A directly towards the upper limit position, and at the same time the decompression means 6 The operation of is stopped. Therefore, the decompression means 6 becomes a pressure adjustment means.

  The cooking utensil will then be in the situation shown in FIGS. 3 and 4, i.e., in a substantially sealed and locked position. Therefore, the pressure of the instrument can be rapidly increased to an operating pressure located in the range of 4.5 to 30 kPa, and the pressure is adjusted by the pressure adjusting means 6.

  If the user wishes to open the lid during cooking, it is sufficient to rotate the knob 3A counterclockwise with a second predetermined stroke, so that the head 9 is inclined via the slope 9. Raise 6A, causing vapor leakage leading to depressurization of the enclosure.

  As shown in FIGS. 5 and 6, the pressure gauge rod 7 </ b> A is no longer supported by the inclination 10 in this state, but the pressure existing inside the closed container is, for example, in the range of 1.5 to 2 kPa. As long as the descending pressure located at is substantially exceeded, it remains at the upper limit position.

  At the upper limit position, the pressure gauge rod 7 </ b> A cooperates with the rib 11 on the intermediate piece 3 </ b> D to prevent the lid 2 from being unlocked with respect to the bowl 1.

  Thereafter, once the pressure inside the closed container drops until it falls below the drop pressure, the pressure gauge rod 7A automatically returns to its lower limit position and allows the lid to be unlocked.

  The operation of opening the lid is ultimately extremely short. That is because it properly defines the operating pressure level for the appliance in conjunction with the drop pressure, which also allows for quick cooking.

Lastly, it should be noted that the present invention is not only aimed at appliances with open safety means, and particularly relates to household appliances for cooking under pressure, which appliances are intended for cooking. A bowl 1, a lid 2 attached to and locked to the bowl 1 to form a substantially sealed closed container for cooking, and the lid 2 is locked and unlocked with respect to the bowl 1. locking / unlocking means 3 for locking said internal relative pressure of the enclosure, to a predetermined value P _C is referred to as substantially constant and cooking pressure, the pressure adjusting means 6, and configured to maintain A safety condition that is acceptable to the user by allowing the pressure present inside the enclosure to be maintained by the pressure regulating means 6 by being operated directly or indirectly by the user. The pressure reducing means 6 is configured to forcibly lower the pressure to a lowering pressure ( relative relative pressure ) that can unlock the lid 2 below, and the pressure adjusting means 6 uses an open safety means. regardless of the cooking pressure _{P C} is to be substantially located in the range of 4.5～19.9KPa, characterized in that it is configured.

  It has been found that the range of 4.5 to 19.9 kPa, and also the range of 5 to 19.9 kPa or the range of 10 to 19.9 kPa is the cooking time and the speed at which the lid is opened during cooking. And provide a very good compromise between them.

Industrial Applicability The industrial application of the present invention consists in designing, manufacturing and using an appliance for cooking food under pressure.

It is a schematic perspective view of the household appliance for cooking under pressure concerning the present invention. It is a disassembled perspective view which shows the detail of embodiment of the cover part in the utensil for cooking which concerns on this invention. It is a fragmentary sectional view which shows the detail of embodiment of the open safety means for the utensil for cooking which concerns on this invention, and is in the middle of the lid | cover part being sealingly locked with respect to a bowl by the user. FIG. 4 is a plan view of the cooking utensil of the present invention corresponding to the details shown in FIG. 3. FIG. 4 is a partial cross-sectional view showing details of the embodiment shown in FIG. 3, in the middle of the progress of decompression of the instrument by the user. FIG. 6 is a plan view showing a cooking utensil according to the present invention corresponding to the details shown in FIG. 5. FIG. 6 is a partial cross-sectional view of the details of the embodiment shown in FIG. FIG. 8 is a plan view of a cooking utensil according to the present invention corresponding to the details shown in FIG. 7. It is a fragmentary sectional view which shows the detail of the same embodiment shown by FIG. 7, and is in the middle of the lid part being unlocked by the user. FIG. 10 is a plan view of the cooking utensil of the present invention corresponding to the details shown in FIG. 9.

Claims (10)

A household appliance for cooking under pressure,
Cooking bowl (1),
A lid (2) attached to the bowl (1) and locked to form a substantially sealed closed container for cooking;
Lock / unlock means (3) for locking and unlocking the lid (2) with respect to the bowl (1);
The interior of the relative pressure of the closed container, to a predetermined value, referred to as substantially constant and the cooking pressure (P _C), a pressure adjusting means arranged to maintain (6),
By operating directly or indirectly by the user, the pressure in the closed container maintained by the pressure adjusting means (6) can be reduced under the safe conditions acceptable to the user. Decompression means (6) configured to force the pressure to drop to a relative pressure that can be unlocked (2) , and
Corresponding to the pressure existing in the closed container, and allowing the lid (2) to be locked and unlocked with respect to the bowl, in cooperation with the locking / unlocking means, the bowl (1 Open safety means (7) attached so as to move between the upper limit position where the lid (2) is prevented from being unlocked with respect to
Have
The pressure adjusting means (6) is configured so that the cooking pressure (P _C ) is approximately in the range of 4.5 to 30 kPa,
The pressure reducing means (6) is configured so that the relative pressure of descent is substantially in the range of 1 to 4 kPa,
Instrument the open safety means, the internal pressure of the closed vessel, the drop relative pressure, when it reaches, which is characterized in that is configured to drop towards the lower limit position. The instrument according to claim 1, wherein the descending relative pressure is substantially located in a range of 1.5 to 4 kPa. The instrument according to claim 2, wherein the descending relative pressure is substantially located in a range of 1.5 to 2 kPa. The appliance according to any one of claims 1 to 3, wherein the cooking pressure (P _C ) is substantially located in a range of 10 to 30 kPa. The appliance according to claim 4, wherein the cooking pressure (P _C ) is approximately equal to 20 kPa.   Once the opening safety means (7) has reached the rising relative pressure value approximately located in the range of 1.5 to 4 kPa, the opening safety means (7) has an upper limit position under the influence of the pressure existing inside the closed container. The device according to any one of claims 1 to 5, wherein the device is configured to be maintained. 7. A device according to claim 6, wherein the rising relative pressure is approximately equal to 3 kPa ± 0.5 kPa. Said appliance comprises actuator means (10) for operating said open safety means (7);
The actuator means (10) is characterized in that the open safety means (7) can be arranged in the upper limit position regardless of the pressure value present inside the closed container. The instrument of any one of 1-7. The open safety means (7), according to any one of claims 1-8, characterized in that it comprises a signal means for indicating whether or not it is possible to open the lid to the user Instruments. The instrument according to claim 9, wherein the signal unit includes a member that is visible or invisible to a user's eye according to a position .

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